Inkjet printing apparatus and inkjet printing method

Abstract

An inkjet printing apparatus and an inkjet printing method are provided which can minimize air current disturbances that occur between the print head and the print medium and also minimize density unevenness caused by mask patterns. For this purpose, the 2-pass printing is performed such that the high printing ratio region and the low printing ratio region are alternated every pixel in the nozzle-arrayed direction and that adjoining groups of high printing ratio regions are separated from one another by a group of low printing ratio regions that forms a passage wide enough for air currents to pass through.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to an inkjet printing method and an inkjet printing apparatus which print images on a print medium by using an inkjet print head formed with nozzle arrays, each having ink ejecting nozzles arranged at high density.[0003]2. Description of the Related Art[0004]As information processing devices, such as computers and word processors, and communication devices have come into wide use, there are growing demands for output devices that output digital image information processed by the information processing devices onto a medium. As one such output device, an inkjet printing apparatus that forms an image by ejecting ink droplets to form dots on a print medium is rapidly finding its widespread use. To improve the printing speed and the resolution of printed images, this inkjet printing apparatus uses a print head that has a large number of ejection portions (also referred to nozzles) arranged in a...

AI Technical Summary

Benefits of technology

[0011]It is therefore an object of this invention to provide an inkjet printing apparatus and an inkjet printing method that can minimize air current disturbances occurring between the print head and the print medium to reduce density unevenness that would otherwise be caused by mask patterns.

[0016]With the above arrangement, an inkjet printing apparatus and an inkjet printing method have been realized which can minimize air current disturbances that occur between the print head and the print medium, thereby preventing density unevenness that would otherwise be caused by the mask patterns.

Problems solved by technology

This wrapping air currents may in turn deflect the direction of ejected ink droplets, resulting in dot landing positions being deviated.

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